Instrumentation for the absorbers in the low Beta* Insertions of the LHC

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Concepts are examined for the measurement of luminosity, beam-beam separation and transverse beam shape and size using the high flux of forward neutral particles produced at the low {beta}* (high luminosity) interaction points (IP's) of the LHC. At design luminosity 10{sup 34} cm{sup -2}sec{sup -1} the flux of neutrals striking the neutral beam absorbers (TAN) in front of the D2 beam separation dipoles is high enough ({approx} 8 neutrons per bunch crossing with mean energy 2.3 TeV) to allow measurement of luminosity with 1% precision in {approx} 1.8 x 10{sup 3} bunch crossings and measurement of beam-beam separation at the ... continued below

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49

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Turner, W.C. August 1, 1998.

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Concepts are examined for the measurement of luminosity, beam-beam separation and transverse beam shape and size using the high flux of forward neutral particles produced at the low {beta}* (high luminosity) interaction points (IP's) of the LHC. At design luminosity 10{sup 34} cm{sup -2}sec{sup -1} the flux of neutrals striking the neutral beam absorbers (TAN) in front of the D2 beam separation dipoles is high enough ({approx} 8 neutrons per bunch crossing with mean energy 2.3 TeV) to allow measurement of luminosity with 1% precision in {approx} 1.8 x 10{sup 3} bunch crossings and measurement of beam-beam separation at the collision point with 0.1{sigma}* precision in {approx} 3 x 10{sup 4} bunch crossings. An Argon ionization chamber placed near the shower maximum {approx} 22 cm inside the Cu neutral beam absorber is analyzed as a possible detector. Background effects due to beam-gas interactions, beam-halo scraping, beam crossing angle modulation and transverse drift of the IP are estimated and found to be small compared to the anticipated signals. Extending these concepts to the front quadrupole absorber (TAS) and segmenting the ionization chambers into four quadrants allows additional measurements of the beam-beam crossing angle and the transverse position of the IP.

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49

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  • Journal Name: Physical Review Special Topics--Accelerator&Beams

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  • Report No.: LBNL-42180
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 1004997
  • Archival Resource Key: ark:/67531/metadc833887

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  • August 1, 1998

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  • May 19, 2016, 3:16 p.m.

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  • June 15, 2016, 8:43 p.m.

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Turner, W.C. Instrumentation for the absorbers in the low Beta* Insertions of the LHC, article, August 1, 1998; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc833887/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.